I think that Ed said that a DS reunion was never discussed or even mentioned.
Despite all 'bad things' that involves the Instituition RRHOF, in my opinion, I think that Mark, David, John, Guy and a drummer (Pick would not be there anyway) should have played, at least, one song.
I think that Ed said something like: They should have played together for the fans.
If Mark was there, someone would did a proper introduction. Not that self-something that the guys did.
Would no harm for anyone.